mostly Serbia
Yes, the United States bombed the Peoples Republic of China embassy by mistake. This happened on May 7, 1999 during the Nato bombing of Yugoslavia.
Supranationalism: NATO Devolution: Yugoslavia
In 1999 NATO bombed Serbia and Montenegro two republics of former Yugoslavia that kep its name.
Some key events that ended in 1999 include the NATO bombing of Yugoslavia, the impeachment trial of President Bill Clinton, and the Panama Canal officially being transferred back to Panama from the United States.
military targets
ethnic tension had led to war in the region.
The Kosovo peace agreement on June 11, 1999, was signed by representatives of the Federal Republic of Yugoslavia, specifically Deputy Prime Minister of Yugoslavia, Nikola Šainović, and the commander of NATO forces, General Wesley Clark. This agreement came after a 78-day NATO bombing campaign aimed at ending the conflict in Kosovo. It set the framework for the withdrawal of Yugoslav forces and the establishment of a United Nations-administered interim government in the region.
military targets
Aleksandar Jaksic has written: 'NATO intervention in the former Yugoslavia'
NATO intervened in conflicts in these two countries that were formerly Yugoslavia.
Yes, NATO has launched military attacks in the past, such as the bombing campaign in Kosovo in 1999 and the intervention in Libya in 2011.